Development of a waveguide NbN-based SIS mixer in the 900-GHz band Takeda, M. ; Uzawa, Y. ; Wang, Zhen ; Saito, A. ; Kawakami, A. Abstract Publication: IEEE Transactions on Applied Superconductivity Pub Date: June 2003 DOI: 10.1109/TASC.2003.814003 Bibcode: 2003ITAS...13..692T